Stop mechanism for machinery.



No. 725,571. PATBNTED APR. 14, 1903. T. J. LANDRUM, 1;. J. BAMBERGER & 1). o. WRIGHT. STOP MECHANISM FOR MACHINERY.

APPLICATION FILED FEB. 18, 1901 N0 MODEL.

UNITED STATES PATENT OFFICE.

TOM J. LANDRUM AND LEON J. BAMBERGER, OF LOUISVILLE, KENTUCKY, AND DAVID C. WRIGHT, 0F NEW ALBANY, INDIANA.

STOP MECHANISM FOR MACHINERY.

SPECIFICATION forming part of Letters Patent No. 725,571, dated April 14:, 1903.

Application filed February 18,1901. Serial No. 47,790. (No model.)

To aZZ whom, may concern:

Be it known that we, TOM J. LANDRUM and LEON .I. BAMBERGER,of Louisville,Kentucky, and DAVID C. WRIGHT, of New Albany, Indiana, citizens of the United States, have invented certain Improvements in Stop Mechanism for Machinery, of which the following is a specification.

The invention is animprovementin device forstopping an engine or motor automatically at predetermined periods of time and instantly by 'means of individual push-buttons, all as will be hereinafter fully described, and specifically set forth in the appended claim.

In large factories where there are a number of machines driven by shaftsand belt connections and in which girls are employed to operate the machines the operators are liable to serious accident by getting their hair or dress caught in the rapidly-moving belts, and serious results from such accidents could. be prevented only by quicklystopping the driving-shafts or motor by which they are driven. I

The primary object of this invention, therefore, is to provide simple and effective devices by which the motor can be instantly stopped by any one of the operators through the medium of a push-button and electrical connections including a magnet, which when energized attracts its armature to trip the devices which throw the switch-lever.

A further object of the invention is to in-. clude in the circuit a clock, contact-points,

In carrying out our invention we provide a clock. A, having a face-plate B, upon which are marked the numerals representing the hours from 1 to 12 and also intermediate marks indicating the quarter hours when read in connection with the hour-hand,

and at each one of these points on the faceplate is attached a metallic pin 1), the said pins being all arranged in the path of a spring a, projecting from the hour-hand of the clock.

The contact points or pins 7) are all connected individually to metallicplng-holes 0, formed in a switchboard 0, located below the clock,

' the connections being made by'separate wires .9. The arrangement of the plug-holes on the with the marks and contact-points on the faceplate and connected,respectively,one with the other. At one end of this switchboard is a post D, to which is connected a wire .9, leading to one pole of the batteryl through the coil of a magnet E, and to said post is also connected a number of wires d, carrying switch-plugs adapted to fitthe plug-holes c,

hereinbefore referred to; The other pole of battery 1 is connected directly to the clockworks m by a wire .9 and it will be here noted that the partial circuit traced by the hourhand is completed when said hour-hand contacts with a 'pin b, that is electrically connected with the post D through the switchboard connections and that when the circuit as completed the magnet becomes energized and attracts its armature, which operates the devices We shall now proceed to describe.

The electromagnet is mounted on a board or support F, and to the armature G of said magnet is attached a rod G, which is adapted to operate a trigger H, the latter releasing a weight Land said weightwhen released serves to throw the switch-lever L of the motor. For

this purpose the said weight is supported of the circuit in themanner hereinbefore de- 5' scribed the trigger is tripped and, releasing the weight, the latter throws the lever which stops the motor. The mechanism hereinbefore described is therefore operated at inter- "vals of time determined by the connection of I00 the post D with any number of plug-holes c, and it will be apparent that connections can be made to stop the motor every hour or at any interval of time desired.

To provide for stoppingvthe motor independent of the time mechanism, a wire t is connected to the post D and a wire t is connected directly to the clockworks, and interposed between these wires tand t are a series of pushbuttons, (designated by the numeral 2.) By this arrangement the circuit is completed by the operation of any one of the push-buttons 2, the circuit being then traced as follows: from one pole of the battery to the elockworks by wire 3 to the push-button by wire t, to the postD by wire t, from said post to the magnet by wire 3, and from the magnet to the other pole of the battery by wire 3 It is intended to locate these push-buttons 2 near all the operators, so that in case one should meet with an accident requiring the stopping of the machinery any operator can quickly stop the motor by pushing a button.

In the same circuit with the push-buttons 2 is a push-button 3, located near the clock, to be operated by an attendant. There is also an electric hell 4 in circuit with the battery and operated independently by pushbutton 5.

From the foregoing description, in connection with the accompanying drawings, the construction and operation of the electric stop mechanism will be readily understood, and it will be noted that We provide for stopping the motor at predetermined periods of timefor instance, at such times when it is scheduled to stop the machinery for oiling, for the regular dinnerhour, and for quitting-and also provide for stopping the motor instantly to prevent serious results in case of an accident of any kind.

Having thus described our invention, We claim Stop mechanism for the purpose set forth, comprising a magnet, switchboard and clock mechanism in circuit with a battery, contact-points on the face of the clock connected to the switchboard, and a spring portion at the outer end of the hour-hand of the clock adapted to pass over said contact-points,

substantially as shown; combined with an armature attracted by the magnet, a pin having a horizontal end portion, a weight supported from its upper end loosely on said horizontal portion of the pin, a bell-crank lever having one of its members bearing against the central portion of the weight and adapted to move said weight off the aforesaid pin, a switch-lever, and a short chain connecting the weight to the outer end of the switch-lever, as shown and described. TOM J. LANDRUM. LEON J. BAMBERGER. DAVID C. WRIGHT. In presence of GEO. T. STAPLES, PETER II. STEINHAUS. 

